Ferrite Polymer Composites General Information Ferrite polymer composites Ferrite cores are familiar as brittle, rigid and bulky components for high-inductance coils and transformers. The performance of such ferrites depends very much on external influences such as temperature, pressure, electromagnetic fields and frequency. FPC is a homogeneous mixture of ferrite powder and plastic with outstanding mechanical and magnetic properties. This rugged material can be processed into injection-molded parts or thin, flexible film to open up innovative applications. The new C351 film is suitable for high-temperature applications up to 200 °C and is UL 94-V0-listed. It is also available with copper coatings of 35 to 75 µm and in various thicknesses from 0,2 to 0,4 mm. FPC film of materials C350 and C351 can also be supplied in self-adhesive versions. FPC film is ideal for EMC applications, e.g. to shield coils against metals or absorb interference at frequencies of 500 MHz and higher. It opens up many other applications, such as implementation of low-profile coils for identification systems and electronic article surveillance in retailing and logistics, for sensors or contactless smart cards. FPC can also be used for compensation of deflection yoke coils in TV picture tubes and computer monitors. This innovative material is also suitable as spacing between ferrite cores – instead of air gaps or non-magnetic films – to suppress leakage fields, for instance, or to adjust the biasing curve. 559 08/01 FPC C302 C 302, C 351 Basic features ■ ■ ■ ■ ■ Composite material of polymer and ferrite for injection molded parts Minor influence of temperature High dc magnetic bias capability Suitable for a wide frequency range High electrical resistance Technical benefits ■ High mechanical stability ■ Excellent dimensional stability ■ Manufacturing technique: injection molding → production of any core shape possible ■ Distributed air gap → low winding losses Applications ■ ■ ■ ■ Inductive proximity switches Identification systems, e.g. immobilizer in automobiles Non-contact power transmission Resonance inductors for DC/DC converters Core shapes on request Physical properties Material Symbol Unit C302 Initial permeability; f = 1 MHz µi Flux density (near saturation) H = 25 kA/m; f = 10 kHz BS (25 °C) mT 330 Remanent flux density H = 25 kA/m; f = 10 kHz Br (25 °C) mT 15 Coercive field strength H = 25 kA/m; f = 10 kHz HC (25 °C) A/m 770 Relative loss factor tanδ/µi 17 ± 20 % f= 1 MHz f = 100 MHz < 0,0004 < 0,03 Hysteresis material constant ηB 10 –3/mT < 0,25 Temperature coefficient α = ∆µ/µ∆T 1/K < 0,0002 kg/m3 3500 Density ρ Resistivity Ωm f = 10 kHz f = 10 MHz 21 13 εr Dielectric constant 280 100 f = 10 kHz f = 10 MHz Max. operating temperature °C Tmax 560 08/01 180 FPC Film C 350, C 351 B68450 … B68452 Basic features ■ FPC is a composite material of polymer and ferrite ■ FPC film is a thin, mechanically flexible film Technical benefits ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Stable magnetic characteristics Low weight: FPC film is 40% lower in density than ferrite High mechanical strength Shaping as required: customer-specific solutions possible Economy: easy transport and storage, simple, rationalized processing, low mounting volume C351 film suitable for high-temperature applications (up to 200 °C) Material C351 approved to UL 94-V0 (E 140 693) Various film thickness (from 0,2 to 0,4 mm) Self-adhesive versions C351 film with optional copper coatings 35 to 75 µm thick Applications ■ Implementation of low-profile coils, e.g. for ■ ■ ■ ■ – identification systems – security tags for electronic article surveillance – sensors – inductive reading of smart cards Electromagnetic shielding of coils from metals to prevent interference EMC: absorption of radiated emissions at frequencies ≥ 500 MHz Compensation of deflection yokes to correct distortion at the corners of TV screens and monitors Spacing between ferrite cores (as a substitute for air gaps or non-magnetic films) for – suppression of the leakage field – adjustment of the biasing curve 561 08/01 FPC Film C 350, C 351 B68450 … B68452 Ordering details The ordering codes are structured as follows: 1st group 2nd group Design Film thickness/width 3rd group B68450: Film on reel A: 0,2 mm 0080: 80 mm Copper coating1) /material X: Default letter B: 0,3 mm B68451: Film on reel, self-adhesive 350 351 C: 0,4 mm A: 35 µm B68452: Film on reel, copper-coated B: 50 µm (only in combination(with C351!) C: 75 µm Material Thickness (mm) Extra features Ordering code C350 0,2 C351 0,2 C350 C350 0,2 0,2 self-adhesive B68451-A0080-X350 B68451-A0080-X350 C351 C351 0,3 0,3 self-adhesive B68451-B0080-X351 B68451-B0080-X351 C351 C351 0,2 0,2 copper-coated B68452-A0080-X351 B68452-A0080-X351 B68450-A0080-X350 B68450-A0080-X351 FPC film is supplied in units of 50 m length. 1) Copper coating only in combination with C351. 562 08/01 351 FPC Film C 350, C 351 B68450 … B68452 Physical properties (material values defined on 0,2 mm thick film) Material Initial Symbol permeability 1) Unit µi C350 C351 3) 9 ± 20 % 9 ± 20 % f = 1 MHz Flux density (near saturation) 1) H = 25 kA/m f = 10 kHz BS mT 255 255 Remanent flux density 1) H = 25 kA/m f = 10 kHz Br mT 9 9 Coercive field strength 1) H = 25 kA/m f = 10 kHz HC A/m 600 600 Relative loss factor 1) f = 10 MHz f = 1 GHz tanδ/µi < 0,005 < 0,400 < 0,005 < 0,400 Hysteresis material constant ηB <2 <2 Temperature coefficient1) 10 -3/mT α = ∆µ/µ∆T Density Resistivity 1) f = 1 kHz f = 10 MHz ρ Dielectric constant 1) f = 1 kHz f = 10 MHz εr Dielectric strength 10 –5 < 5 · 10 –5 1/K <5· kg/m3 2930 2930 500 100 500 100 700 21 700 21 Ωm kV/mm 1 0,8 Max. operating temperature Tmax °C 120 200 Tensile strength 2) σZ N/mm 2 1,5 2,5 % 25 25 N/mm 2 70 70 Tearing resistance 2) Compressibility 2) κ 1) T = 25 °C in accordance with IEC 51 (CO) 282 2) T = 23 °C and 50 % r.h. 3) UL 94, flame class V0 (listed E 140 693) 563 08/01 Herausgegeben von EPCOS AG Marketing Kommunikation, Postfach 80 17 09, 81617 München, DEUTSCHLAND EPCOS AG 2000. Alle Rechte vorbehalten. Vervielfältigung, Veröffentlichung, Verbreitung und Verwertung dieser Broschüre und ihres Inhalts ohne ausdrückliche Genehmigung der EPCOS AG nicht gestattet. Mit den Angaben in dieser Broschüre werden die Bauelemente spezifiziert, keine Eigenschaften zugesichert. Bestellungen unterliegen den vom ZVEI empfohlenen Allgemeinen Lieferbedingungen für Erzeugnisse und Leistungen der Elektroindustrie, soweit nichts anderes vereinbart wird. Diese Broschüre ersetzt die vorige Ausgabe. Fragen über Technik, Preise und Liefermöglichkeiten richten Sie bitte an den Ihnen nächstgelegenen Vertrieb der EPCOS AG oder an unsere Vertriebsgesellschaften im Ausland. Bauelemente können aufgrund technischer Erfordernisse Gefahrstoffe enthalten. Auskünfte darüber bitten wir unter Angabe des betreffenden Typs ebenfalls über die zuständige Vertriebsgesellschaft einzuholen. Published by EPCOS AG Marketing Communications, P.O. Box 80 17 09, 81617 Munich, GERMANY EPCOS AG 2000. All Rights Reserved. Reproduction, publication and dissemination of this brochure and the information contained therein without EPCOS’ prior express consent is prohibited. The information contained in this brochure describes the type of component and shall not be considered as guaranteed characteristics. Purchase orders are subject to the General Conditions for the Supply of Products and Services of the Electrical and Electronics Industry recommended by the ZVEI (German Electrical and Electronic Manufacturers’ Association), unless otherwise agreed. This brochure replaces the previous edition. For questions on technology, prices and delivery please contact the Sales Offices of EPCOS AG or the international Representatives. Due to technical requirements components may contain dangerous substances. For information on the type in question please also contact one of our Sales Offices. 1